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PCV gases and K and N pod filters

  • Thread starter Thread starter surviverguy
  • Start date Start date
Billy Ricks said:
A few Harley tuners have tried the Krank Vent on dynos. Harley is their target market but Harleys already have a valve that serves the same function. The tuners couldn't find any hp in these vents because of that and there probably just isn't any to be found.
Click to expand...
But do dynos really simulate driving conditions and wind forces? Or maybe the wind has nothing to do with it. I don't know...just curious about venting options/ ideas...
 
What the other valves do not do is main a constant vacuum of no more than 3 to 5 lbs in the crank case. It is a one way umbrella valve that is ported to relieve any more vacuum than it is designed to maintain. It is designed for early model Evolution motors that do not have a valve. Dyno tests are useless in evaluating the benefit of the valve. I believe Hayden made a mistake in claiming there might be a HP gain. The only high speed benefit for the inline four is the possible relief of an air dam effect allowing a positive crank case pressure to build, and that may be debatable. As far as low speed power, smoothness and better gas mileage, it has worked for me and I don't think your bike would be any different.
 
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tkent02 said:
It's just exhaust that took a slight detour around the exhaust pipe, and with a tiny amount of oil in it. The same mix of CO, hydrocarbons and whatever else comes out the tail pipe. It's the same stuff. The only difference is it leaked past the rings instead of passing down the exhaust pipe.
It all goes to the atmosphere just the same.
Catch the oil somehow and you are running as clean as anyone else.
Click to expand...
Bike needs a small diaper and regular diaper changing (LOL)
 
surviverguy said:
Bike needs a small diaper and regular diaper changing (LOL)
Click to expand...

Actually, on my old 750/1000, running a small catch can with a filter attached, I got about a teaspoon of oil after six months, it's just not a problem. The filter stayed dry, so no oil had escaped.

I like your idea of a catch can with the drain to let the oil run down into the engine, but really with a tight engine, there is next to nothing to drain back.
The screens in the top of the valve cover do exactly the same thing, and they do it very well.

More oil will leak out of your shifter seal.
 
tkent02 said:
Actually, on my old 750/1000, running a small catch can with a filter attached, I got about a teaspoon of oil after six months, it's just not a problem. The filter stayed dry, so no oil had escaped.

I like your idea of a catch can with the drain to let the oil run down into the engine, but really with a tight engine, there is next to nothing to drain back.
The screens in the top of the valve cover do exactly the same thing, and they do it very well.

More oil will leak out of your shifter seal.
Click to expand...
I did notice that the 1)vent cover/top looked rather well designed for minimizing oil losses and also noticed 2) that the old tube from vent to airbox was in pretty good shape and 3)the old airbox wasn't very oily.
I've had poorly designed vent arrangements on other vehicles (VW scirroco comes to mind) and some tractors with awful piston rings/blowby....in comparison this old GS looks relatively blowby-free....although I've yet to produce any blowby or exhaust smoke for that matter....just trying to plan things out ahead to reduce redos/changes...
 
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